Question 540Steam Plants - Assistant Engineer

70% to pass

A Kingsbury, or pivot shoe type thrust bearing, can bear much greater loads per square inch of working surface than can parallel surface bearings because provisions are made in the Kingsbury bearing _______________.

Afor automatically adjusting clearances to the correct value when wear occurs
Bfor adjusting the filler piece thickness behind the pivotal-shoes to give a more accurate fit
Cto allow the leveling plates to pivot on the collar when thrust loads are applied
Dfor the shoes to tilt slightly, thereby allowing the formation of a wedge shaped oil film under a thrust load
AI Explanation

The correct answer is D. The Kingsbury or pivot shoe type thrust bearing can bear much greater loads per square inch of working surface compared to parallel surface bearings because the design allows the shoes to tilt slightly, thereby forming a wedge-shaped oil film under a thrust load. This wedge-shaped oil film generates high pressure, which enables the bearing to support greater loads without excessive wear or failure. The other options are incorrect because they do not directly address the key reason for the superior load-carrying capacity of the Kingsbury bearing design. Options A, B, and C describe other features or adjustments, but do not explain the specific mechanism of the tilting shoes that creates the wedge-shaped oil film.

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Official Resources
46 CFR Machinery & Electrical 46 CFR Engineering USCG National Maritime Center
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